Petrogenesis of Neogene dacitic and andesitic volcanism in the Tel Gorban-Chah Breshk area North of Shahrebabak, Kerman-Iran

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HOSSEINI S.Z.; ARVIN M.

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Journal: GEOSCIENCES Year:2016 | Volume:26 | Issue:101 Page(s): 11-22

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Title

Petrogenesis of Neogene dacitic and andesitic volcanism in the Tel Gorban-Chah Breshk area North of Shahrebabak, Kerman-Iran

Author(s)

HOSSEINI S.Z. | ARVIN M. | Issue Writer Certificate

Keywords

NeogeneQ2

Tel GorbanQ1

Chah BreshkQ1

DaciteQ2

AndesiteQ2

calc alkalineQ2

AdakiteQ2

Abstract

Neogene volcanism in the Tel Gorban-Chah Breshk area, north of Shahre-Babak, occurs as dacitic to andesitic lava flows and domes. Petrographically the rocks consist of plagioclase, hornblende ± biotite and quartz phenocrysts setting in porphyritic and hyalopilitic matrix. Opacitization of hornblende and biotite and zoning and sieve texture in plagioclase are signatures of disequilibrium conditions through the magma cooling. Geochemical data and petrological diagrams show their medium potassic calc-alkaline nature. Enrichment in LILE’ s and depletion in HFSE’ s (eg. Nb, Ta, Ti) points to a subduction tectonic environment for Tel Gorban-Chah Breshk dacitic to andesitic rocks. Furthermore, their Al2O3>16, Sr/Y>80 and chondrite normalize REE pattern are quite similar to dakites. Distinctive geochemical features such as Rb/Sr< 0. 04, La/Yb> 18, Yb< 1, (Sr/Y)n> 80, and Y<10, suggest their derivation from partial melting of a subducted oceanic lithosphere with the garnet remains in the source region. They are emplaced along the faults and fractures in the post collisional tectonic regime in the Neogene time.

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APA: Copy

HOSSEINI, S.Z., & ARVIN, M.. (2016). Petrogenesis of Neogene dacitic and andesitic volcanism in the Tel Gorban-Chah Breshk area North of Shahrebabak, Kerman-Iran. GEOSCIENCES, 26(101 ), 11-22. SID. https://sid.ir/paper/31828/en

Vancouver: Copy

HOSSEINI S.Z., ARVIN M.. Petrogenesis of Neogene dacitic and andesitic volcanism in the Tel Gorban-Chah Breshk area North of Shahrebabak, Kerman-Iran. GEOSCIENCES[Internet]. 2016;26(101 ):11-22. Available from: https://sid.ir/paper/31828/en

IEEE: Copy

S.Z. HOSSEINI, and M. ARVIN, “Petrogenesis of Neogene dacitic and andesitic volcanism in the Tel Gorban-Chah Breshk area North of Shahrebabak, Kerman-Iran,” GEOSCIENCES, vol. 26, no. 101 , pp. 11–22, 2016, [Online]. Available: https://sid.ir/paper/31828/en

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